Hide Regenerate Cycles button when no membership fee type assigned

- Button only shown when @member.membership_fee_type is set (same as Create Cycle).
- Test: no-type view asserts Regenerate Cycles button is not present.

lib/mv_web/live/member_live/show/membership_fees_component.ex

@@ -53,7 +53,7 @@ defmodule MvWeb.MemberLive.Show.MembershipFeesComponent do
         <%!-- Action Buttons (only when user has permission) --%>
         <div class="flex gap-2 mb-4">
           <.button
-            :if={@can_create_cycle}
+            :if={@member.membership_fee_type != nil and @can_create_cycle}
             phx-click="regenerate_cycles"
             phx-target={@myself}
             class={["btn btn-sm btn-outline", if(@regenerating, do: "btn-disabled", else: "")]}